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Diffstat (limited to 'src/cmd/link/internal/ld/sym.go')
| -rw-r--r-- | src/cmd/link/internal/ld/sym.go | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/src/cmd/link/internal/ld/sym.go b/src/cmd/link/internal/ld/sym.go new file mode 100644 index 0000000..7548972 --- /dev/null +++ b/src/cmd/link/internal/ld/sym.go @@ -0,0 +1,116 @@ +// Derived from Inferno utils/6l/obj.c and utils/6l/span.c +// https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/obj.c +// https://bitbucket.org/inferno-os/inferno-os/src/master/utils/6l/span.c +// +// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. +// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net) +// Portions Copyright © 1997-1999 Vita Nuova Limited +// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com) +// Portions Copyright © 2004,2006 Bruce Ellis +// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net) +// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others +// Portions Copyright © 2009 The Go Authors. All rights reserved. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package ld + +import ( + "cmd/internal/objabi" + "cmd/internal/sys" + "cmd/link/internal/loader" + "cmd/link/internal/sym" + "log" + "runtime" +) + +func linknew(arch *sys.Arch) *Link { + ler := loader.ErrorReporter{AfterErrorAction: afterErrorAction} + ctxt := &Link{ + Target: Target{Arch: arch}, + version: sym.SymVerStatic, + outSem: make(chan int, 2*runtime.GOMAXPROCS(0)), + Out: NewOutBuf(arch), + LibraryByPkg: make(map[string]*sym.Library), + numelfsym: 1, + ErrorReporter: ErrorReporter{ErrorReporter: ler}, + generatorSyms: make(map[loader.Sym]generatorFunc), + } + + if objabi.GOARCH != arch.Name { + log.Fatalf("invalid objabi.GOARCH %s (want %s)", objabi.GOARCH, arch.Name) + } + + AtExit(func() { + if nerrors > 0 { + ctxt.Out.Close() + mayberemoveoutfile() + } + }) + + return ctxt +} + +// computeTLSOffset records the thread-local storage offset. +// Not used for Android where the TLS offset is determined at runtime. +func (ctxt *Link) computeTLSOffset() { + switch ctxt.HeadType { + default: + log.Fatalf("unknown thread-local storage offset for %v", ctxt.HeadType) + + case objabi.Hplan9, objabi.Hwindows, objabi.Hjs, objabi.Haix: + break + + case objabi.Hlinux, + objabi.Hfreebsd, + objabi.Hnetbsd, + objabi.Hopenbsd, + objabi.Hdragonfly, + objabi.Hsolaris: + /* + * ELF uses TLS offset negative from FS. + * Translate 0(FS) and 8(FS) into -16(FS) and -8(FS). + * Known to low-level assembly in package runtime and runtime/cgo. + */ + ctxt.Tlsoffset = -1 * ctxt.Arch.PtrSize + + case objabi.Hdarwin: + /* + * OS X system constants - offset from 0(GS) to our TLS. + */ + switch ctxt.Arch.Family { + default: + log.Fatalf("unknown thread-local storage offset for darwin/%s", ctxt.Arch.Name) + + /* + * For x86, Apple has reserved a slot in the TLS for Go. See issue 23617. + * That slot is at offset 0x30 on amd64. + * The slot will hold the G pointer. + * These constants should match those in runtime/sys_darwin_amd64.s + * and runtime/cgo/gcc_darwin_amd64.c. + */ + case sys.AMD64: + ctxt.Tlsoffset = 0x30 + + case sys.ARM64: + ctxt.Tlsoffset = 0 // dummy value, not needed + } + } + +} |